<script setup lang='ts'>

import { ref, watchEffect } from "vue"

/**
 * 实现该指令 :
 * 当切换该选项卡时，列表项文本颜色变为红色
 * 
*/
const VActiveStyle = {

  mounted(el, binding) {
    const [styles, fn] = binding.value
    watchEffect(()=>{
    Object.keys(styles).forEach(key=>{
      el.style[key] = fn() ? styles[key]: ''
    })
  })

  },

}

const list = [1, 2, 3, 4, 5, 6, 7, 8]
const activeTab = ref(0)
function toggleTab(index: number) {
  activeTab.value = index
}

</script>

<template>
  <ul>
    <li v-for="(item, index) in list" :key="index" v-active-style="[{ 'color': 'red' }, () => activeTab === index]"
      @click="toggleTab(index)">
      {{ item }}
    </li>
  </ul>
</template>

